1、Curing rheokinetics of epoxy

The article examines the curing of epoxy resin, based on diglycidyl ether Bisphenol-A, with the amine hardener Aramin (a mixture of aliphatic and aromatic amines). It was found that curing at 20, 40 and 60 °C is accompanied by microgelation. Coefficients of viscosity increase k η rise by 2, 3 and 4 times respectively.

2、Journal of Applied Polymer Science

In this study, two different curing agents with six amine functional groups each were synthesized via a two-step reaction. In the first step, isophorone diamine (IPDI) was reacted with two equivalents of pentaerythritol triacrylate (PETA).

3、Epoxy Curing Agents

Amine curing agent technology for curing polyisocyanate resins. Amicure® IC series of products are specifically designed for use with polyisocyanate resins and other standard HDI trimer based polyisocyanates.

4、Epoxy Curing Agents – Part 1: Amines

Part 1 of this blog series has given a general introduction to amines, the largest class of curing agents for epoxy resins. We have a general understanding of how amines work and how to calculate the amount of amine required to cure an epoxy resin.

Amine curing of epoxy resins: options and key formulation

This paper provides an overview of the wide variety of amine hardeners, with an emphasis on polyetheramines from Huntsman Performance Products that can expand the capabilities of epoxy formulators into new applications.

In

In this paper, amines in epoxy curing agents are introduced, including their various types, unique assimilation characteristics, wide application fields and significant advantages.

Modified amine curing agents of epoxy resins and materials

A review of the most commonly used amine curing agents of epoxy diane resins is presented. A method for radically improving the processing and performance properties of materials based on cured epoxy diane resins using the proposed technique for modifying curing agents is described.

Amine Curing of Epoxy Resins: Options and Key Formulation

Amines and amine derivatives are the most diverse group of epoxy curing agents. The fully polymerized epoxy resins exhibit a very wide range of thermal and mechanical properties.

Bio

Bio-based epoxy curing agents from lignin was synthesized by ring-opening reactions of cyclic aza-silane species to obtain lignin-based curing agents with amine hydroxyl equivalent weights up to 68 g/eq.

Epoxidized soybean oil modified using fatty acids as tougheners for

Epoxidized soybean oil modified using fatty acids as tougheners for thermosetting epoxy resins: Part 2—Effect of curing agent and epoxy molecular weight

In modern industrial and construction fields, epoxy fatty amine curing agents, as a critical component of epoxy resin systems, directly influence the performance of the final products. The pH value of these curing agents is a key factor determining their effectiveness. This article explores how the pH value of epoxy fatty amine curing agents affects the curing process, material properties, and application scope.

1. Definition and Importance of pH Value

pH value refers to the negative logarithm of the hydrogen ion concentration in a solution, typically denoted by the Greek letter "p". For most chemical reactions, pH is a vital parameter as it governs reaction rates, product properties, and catalyst efficiency. For epoxy fatty amine curing agents, pH not only impacts curing speed but also critical properties such as mechanical strength and chemical resistance of the cured material.

2. Impact of pH Value on the Curing Process

Curing Speed: pH directly affects the reaction rate between the curing agent and the resin. Generally, acidic conditions (lower pH) accelerate the reaction, while alkaline conditions (higher pH) slow it down. This is because different curing agents have optimal pH ranges. For example, some curing agents exhibit higher activity under acidic conditions, promoting rapid cross-linking, whereas alkaline conditions may induce side reactions, leading to incomplete curing.

Curing Degree: pH also influences the microstructure of the cured material. Within an appropriate pH range, epoxy fatty amine curing agents form uniform and dense cross-linked networks, resulting in superior mechanical properties. excessively high or low pH values can cause incomplete curing or overcuring, degrading material performance.

3. Impact of pH Value on Material Properties

Mechanical Strength: The performance of cured epoxy fatty amine materials largely depends on the cross-linked network formed during curing. Proper pH control ensures adequate and uniform network formation, enhancing mechanical strength. For instance, high-strength applications often require specific pH conditions to optimize mechanical properties.

Chemical Resistance: The chemical resistance of cured materials is another critical indicator. Variations in pH affect the material’s resistance to acids, bases, and other chemicals. Adjusting pH allows for tailored chemical resistance to suit specific application requirements.

4. Impact of pH Value on Application Scope

The demand for epoxy fatty amine curing agents varies across applications, making pH selection crucial. For example:

• In scenarios prioritizing high mechanical strength over extreme chemical resistance, curing agents with lower pH may be preferred.
• Conversely, applications demanding exceptional chemical resistance but lesser mechanical strength might require curing agents with higher pH.

The pH value of epoxy fatty amine curing agents significantly impacts the curing process, material properties, and application range. To achieve optimal performance, pH must be carefully selected based on specific application requirements. With advancements in materials and technology, research into pH optimization continues to evolve, aiming for more efficient and environmentally friendly solutions.